铁基轨道有序超导体各向异性隧穿电导的理论研究

Q4 Chemistry

International Journal of Nano and Biomaterials Pub Date : 2019-01-31 DOI:10.1504/IJNBM.2019.10018707

S. Jena, S. Agarwalla, G. C. Rout

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引用次数: 0

摘要

我们在这里讨论了Jahn-Tellar（JT）畸变对铁基超导体中超导（SC）间隙的作用，考虑到一带内正方形晶格中的第一和第二近邻（NN）电子跳变模型方法。利用Zubarev的格林函数技术计算了格林函数。依赖于温度的超导间隙和晶格应变是根据相应格林函数的相关函数计算的，并且是自洽计算的。与温度相关的间隙方程表明，在超导转变温度附近，随着第二近邻跳跃的减少，晶格应变的抑制，超导间隙得到了增强。第二个最近跳跃引入了隧道传导的不对称性。

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Theoretical study of anisotropic tunnelling conductance in iron-based orbitally ordered superconductors

We address here the role of Jahn-Tellar (JT) distortion on the superconducting (SC) gap in iron-based superconductors taking into account of the first and second nearest-neighbour (NN) electron hoppings in the square lattice within one band model approach. The Green's functions are calculated by using Zubarev's Green's function technique. The temperature dependent superconducting gap and the lattice strain are calculated from the correlation functions of the corresponding Green's functions and are computed self-consistently. The temperature dependent gap equations show that the superconducting gap is enhanced with the decrease of second nearest-neighbour hopping accompanied by the suppression of lattice strain near the superconducting transition temperature. The second nearest hopping introduces asymmetry in the tunnelling conductance.

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来源期刊

International Journal of Nano and Biomaterials Chemistry-Physical and Theoretical Chemistry

CiteScore

1.20

自引率

0.00%

发文量

期刊介绍： In recent years, frontiers of research in engineering, science and technology have been driven by developments in nanomaterials, encompassing a diverse range of disciplines such as materials science, biomedical engineering, nanomedicine and biology, manufacturing technology, biotechnology, nanotechnology, and nanoelectronics. IJNBM provides an interdisciplinary vehicle covering these fields. Advanced materials inspired by biological systems and processes are likely to influence the development of novel technologies for a wide variety of applications from vaccines to artificial tissues and organs to quantum computers. Topics covered include Nanostructured materials/surfaces/interfaces Synthesis of nanostructures Biological/biomedical materials Artificial organs/tissues Tissue engineering Bioengineering materials Medical devices Functional/structural nanomaterials Carbon-based materials Nanomaterials characterisation Novel applications of nanomaterials Modelling of behaviour of nanomaterials Nanomaterials for biomedical applications Biological response to nanomaterials.